chore(deps): update dependency microsoft.reactive.testing to 6.1.0

Author: renovate[bot]

src/directory.packages.props

@@ -31,7 +31,7 @@
     <PackageVersion Include="FluentAssertions.Analyzers" Version="0.34.1" />
     <PackageVersion Include="ReactiveUI.Testing" Version="20.4.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
-    <PackageVersion Include="Microsoft.Reactive.Testing" Version="6.0.2" />
+    <PackageVersion Include="Microsoft.Reactive.Testing" Version="6.1.0" />
   </ItemGroup>
 
   <ItemGroup>